NASA's JPL site no longer has the moon image on it. Fortunately, I snagged a copy of the 11meg tif. Here is a jpg rerduced to 64k. This already has a spherical projection so apply and map as a sphere to a brice sphere then shine positive lights at the face as needed. Haze will obscure the surface just like other distant objects in your render. You may have to bring it close to the camera in order to preserve details and still keep haze in your scene. The advantage to putting the moon on an object is you can use negative lights to make the moon look partially full. You can also have the moon and sun in the sky together. Thats not possible with the sky lab.